OvmfPkg/AcpiPlatformDxe: Detect QEMU & Xen

Detect QEMU & Xen, and allow each to choose how to publish
the individual ACPI tables.

Currently both paths simply publish the tables unmodified.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13385 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/AcpiPlatformDxe/Xen.c

@@ -0,0 +1,55 @@
+/** @file
+  OVMF ACPI QEMU support
+
+  Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/ 
+
+#include "AcpiPlatform.h"
+#include <Library/HobLib.h>
+#include <Guid/XenInfo.h>
+
+
+BOOLEAN
+XenDetected (
+  VOID
+  )
+{
+  EFI_HOB_GUID_TYPE         *GuidHob;
+
+  //
+  // See if a XenInfo HOB is available
+  //
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+  if (GuidHob == NULL) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+
+EFI_STATUS
+EFIAPI
+XenInstallAcpiTable (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol,
+  IN   VOID                          *AcpiTableBuffer,
+  IN   UINTN                         AcpiTableBufferSize,
+  OUT  UINTN                         *TableKey
+  )
+{
+  return InstallAcpiTable(
+           AcpiProtocol,
+           AcpiTableBuffer,
+           AcpiTableBufferSize,
+           TableKey
+           );
+}
+